Ariz. Admin. Code § 9-7-605

Current through Register Vol. 30, No. 40, October 4, 2024

Section R9-7-605 - X-ray Machine Standards

A. A registrant shall prevent leakage radiation from the diagnostic source assembly measured at a distance of 1 meter in any direction from the source assembly from exceeding 25.8 µC/ kg (100 milliroentgens) in one hour when the x-ray tube is operated at its leakage technique factors. The Department shall determine compliance by obtaining measurements averaged over an area of 100 square centimeters (15.5 square inches) with no linear dimension greater than 20 centimeters (7.9 inches).

B. The registrant shall prevent radiation emitted by a component other than the diagnostic source assembly from exceeding 516 nC/kg (2 milliroentgens) in one hour at 5 centimeters from any accessible surface of the component when it is operated in an assembled x-ray system under any conditions for which it was designed. The Department shall determine compliance by obtaining measurements averaged over an area of 100 square centimeters (15.5 square inches) with no linear dimension greater than 20 centimeters (7.9 inches).

C. Beam quality.

1. The registrant shall prevent the useful beam half-value layer (HVL) for diagnostic x-ray given x-ray tube potential from falling below the values shown in Table I. If it is necessary to determine the HVL at an x-ray tube potential that is not listed in Table I, the registrant shall use linear interpolation or extrapolation to make the determination.

Table I
Design operating range (kilovolts peak)	Measured potential (kilovolts peak)	HVL (millimeters of aluminum) Dental Intraoral Units manufactured after December 1, 1980	Medical X-ray Units manufactured before June 10, 2006 and Dental Intraoral Units manufactured on or before December 1, 1980	Medical X-ray Units manufactured on or after June 10, 2006
Below 51	30	1.5	0.3	0.3
	40	1.5	0.4	0.4
	50	1.5	0.5	0.5
51 to 70	51	1.5	1.2	1.3
	60	1.5	1.3	1.5
	70	1.5	1.5	1.8
Above 70	71	2.1	2.1	2.5
	80	2.3	2.3	2.9
	90	2.5	2.5	3.2
	100	2.7	2.7	3.6
	110	3.0	3.0	3.9
	120	3.2	3.2	4.3
	130	3.5	3.5	4.7
	140	3.8	3.8	5.0
	150	4.1	4.1	5.4

2. If the registrant demonstrates that the aluminum equivalent of the total filtration in the primary beam is not less than that shown in Table II, the registrant is considered to have met the criteria in subsection (C)(1).

Table II - Filtration Required vs. Operating Voltage

Operating Voltage (kVp)	Total Filtration (inherent plus added) (millimeters aluminum equivalent)
Below 51	0.5 millimeters
51 - 70	1.5 millimeters
Above 70	2.5 millimeters

3. The registrant shall use beryllium window tubes that have a minimum of 0.5 millimeters aluminum equivalent filtration permanently mounted in the useful beam.

4. For capacitor energy storage equipment, the Department shall determine compliance with the maximum quantity of charge per exposure.

5. When determining the minimum aluminum equivalent filtration, the registrant shall include the filtration contributed by all materials that are always present between the focal spot of the tube and the patient (for example, a tabletop when the tube is mounted "under the table" and inherent filtration of the tube).

D. Multiple tubes. If two or more radiographic tubes are controlled by one exposure switch, the operator shall clearly indicate which tube or tubes have been selected before initiation of the exposure, activating one light on the x-ray control panel and a second light at or near the tube housing assembly each indicating the tube or tubes that have been selected.

E. Mechanical support of tube head. The registrant shall adjust the tube housing assembly supports so that the tube housing assembly will remain stable during an exposure, unless the tube housing movement is a designed function of the x-ray system.

F. Exposure reproducibility. The coefficient of variation shall not exceed 0.10 when all technique factors are held constant. This requirement is satisfied if the value of the average exposure (E) is greater than or equal to five times the difference between the maximum exposure (Emax) and minimum exposure (Emin) when four exposures are made at identical technique factors, [E=>5(Emax - Emin)].

G. Accuracy deviation. A registrant shall not use an x-ray machine if the measured technique factors for kVp and time duration are not within the limits specified by the manufacturer In the absence of the manufacturer's specifications, a registrant shall not use an x-ray machine if the measured kVp is not within 10 percent of the indicated kVp value and the measured time duration is not within 20 percent of the indicated time.

Ariz. Admin. Code § R9-7-605

New Section R9-7-605, includig Tables I and II, recodified from R12-1-605, Tables I and II, at 24 A.A.R. 813, effective March 22, 2018 (Supp. 18-1).